package com.guozhi.demo;

import java.util.ArrayList;
import java.util.List;

public class Hello {
    public Hello(){

    }
    public void he() throws Exception{
        Class c = getClass().getClassLoader().loadClass("com.alibaba.fastjson.JSONObject");
        Object o = c.newInstance();
        List list = new ArrayList<String>();
        list.add("a");
        list.add("b");
        list.add("c");
        System.out.println(String.join("",list));
    }
}
